BUG: Unionfs 2.0 on kernel version 2.6.20-rt8 reports: circular locking deadlock detected during boot.

[Henri Hunnekens]

============================================
[ BUG: circular locking deadlock detected! ]
--------------------------------------------
udev_run_hotplu/720 is deadlocking current task modprobe/690


1) modprobe/690 is trying to acquire this lock:
[f7019558] {&info->lock}
.. ->owner: f6e52032
.. held by:   udev_run_hotplu:  720 [f6e52030, 121]

2) udev_run_hotplu/720 is blocked on this lock:
[c2718348] {(struct rw_semaphore *)(&((struct unionfs_sb_info *)(sb)->s_fs_info
)->rwsem)}
.. ->owner: f6d9d932
.. held by:          modprobe:  690 [f6d9d930, 120]

udev_run_hotplu/720's [blocked] stackdump:

      f6e5fe38 00000086 ffa94000 c0542500 c2718358 f6d45d50 c2718358 f6e5fdc4
      00000283 f6e5fe08 c0142382 f6e5fe70 f6e5fde0 c02b4056 00000001 f6e52148
      f6e52030 c060ed2b 00000007 0000078c c23edda0 00000000 00000001 00000001
Call Trace:
[<c043760e>] schedule+0x2e/0x110
[<c04386fd>] rt_mutex_slowlock+0xcd/0x29c
[<c0438489>] rt_mutex_lock+0x19/0x20
[<c014334e>] __rt_down_read+0x2e/0x50
[<c014338a>] rt_down_read+0xa/0x10
[<c02778f8>] unionfs_show_options+0xd8/0x150
[<c018c3f5>] show_vfsmnt+0x115/0x130
[<c018eda7>] seq_read+0x157/0x290
[<c01741df>] vfs_read+0xaf/0x180
[<c017473d>] sys_read+0x3d/0x70
[<c0105260>] sysenter_past_esp+0x5d/0x81
=======================

modprobe/690's [current] stackdump:

[<c01062aa>] show_trace_log_lvl+0x1a/0x30
[<c0106972>] show_trace+0x12/0x20
[<c0106a46>] dump_stack+0x16/0x20
[<c01430fc>] debug_rt_mutex_print_deadlock+0x14c/0x160
[<c04386f1>] rt_mutex_slowlock+0xc1/0x29c
[<c0438489>] rt_mutex_lock+0x19/0x20
[<c0438d08>] _mutex_lock+0x8/0x10
[<c027925a>] create_parents_named+0x13a/0x5b0
[<c02797ab>] copyup_named_dentry+0xbb/0xb70
[<c027a29a>] copyup_dentry+0x3a/0x50
[<c027a2eb>] copyup_file+0x3b/0xa0
[<c027d268>] unionfs_file_revalidate+0x728/0xbe0
[<c027d756>] unionfs_flush+0x36/0x140
[<c0171fbc>] filp_close+0x2c/0x70
[<c01731e9>] sys_close+0x69/0xc0
[<c0105260>] sysenter_past_esp+0x5d/0x81
=======================
[ turning off deadlock detection.Please report this trace. ]
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